Don't fetch histograms from the same process.

content/browser/profiler_controller_impl.cc

Index: content/browser/profiler_controller_impl.cc
===================================================================
--- content/browser/profiler_controller_impl.cc	(revision 276708)
+++ content/browser/profiler_controller_impl.cc	(working copy)
@@ -5,7 +5,7 @@
 #include "content/browser/profiler_controller_impl.h"
 
 #include "base/bind.h"
-#include "base/command_line.h"
+#include "base/process/process_handle.h"
 #include "base/tracked_objects.h"
 #include "content/common/child_process_messages.h"
 #include "content/public/browser/browser_child_process_host_iterator.h"
@@ -13,7 +13,6 @@
 #include "content/public/browser/child_process_data.h"
 #include "content/public/browser/profiler_subscriber.h"
 #include "content/public/browser/render_process_host.h"
-#include "content/public/common/content_switches.h"
 
 namespace content {
 
@@ -78,12 +77,12 @@
 
   int pending_processes = 0;
   for (BrowserChildProcessHostIterator iter; !iter.Done(); ++iter) {
-    // Skips requesting profiler data from the "GPU Process" if we are using in
-    // process GPU. Those stats should be in the Browser-process's GPU thread.
-    if (iter.GetData().process_type == PROCESS_TYPE_GPU &&
-        CommandLine::ForCurrentProcess()->HasSwitch(switches::kInProcessGPU)) {
+    // In some cases, there may be no child process of the given type (for
+    // example, the GPU process may not exist and there may instead just be a
+    // GPU thread in the browser process). If that's the case, then the process
+    // handle will be base::kNullProcessHandle and we shouldn't ask it for data.
+    if (iter.GetData().handle == base::kNullProcessHandle)
       continue;
-    }
 
     ++pending_processes;
     if (!iter.Send(new ChildProcessMsg_GetChildProfilerData(sequence_number)))